package com.jelly.io.nio;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class ChannelCopy {
	private static final int BSIZE=1024;
	public static void main(String[] args) throws IOException {
		if(args.length!=2){
			System.out.println("arguments: sourcefile destfile");
			System.exit(1);
		}
		FileChannel in = new FileInputStream(args[0]).getChannel();
		FileChannel out = new FileOutputStream(args[1]).getChannel();
		ByteBuffer buffer = ByteBuffer.allocate(BSIZE);
		while(in.read(buffer)!=-1){
			buffer.flip(); //Prepare for writing
			out.write(buffer);
			buffer.clear(); //Prepare for reading
		}
	}
}
